hydrosphere & oceanography section 6 MCQ Questions & Answers Detailed Explanation

Answer: (c)

Water has a density of 1000 gm/m³. The air that is near sea level has a density that averages 1.275 kg. kg/m³.

If we want to know how much water is dense than air that 1000 kg/m³ divided by 1.275 kg/m³ yields 784. Therefore at sea level air is 784 times less than water.

Answer: (d)

While all other seas in the world are defined at least in part by land boundaries, the Sargasso Sea is defined only by ocean currents. The Sargasso Sea does not have a coastline as it is located in the middle of the Atlantic Ocean.

Answer: (a)

The Gulf Stream is a warm current that originates in the Gulf of Mexico and moves north toward Europe. Since it is full of warm water, the sea surface temperatures are warm, which keeps places like Europe warmer than other areas at similar latitudes.

Answer: (c)

Echo sounding is the technique of using sound pulses to find the depth of water. The interval from the emission of a pulse to the reception of its echo is recorded, and the depth calculated from the known speed of propagation of sound through water.

This information is then typically used for navigation purposes or in order to obtain depths for charting purposes.

Answer: (a)

Answer: (a)